CN101939901B - Power converting device - Google Patents
Power converting device Download PDFInfo
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- CN101939901B CN101939901B CN2008801267065A CN200880126706A CN101939901B CN 101939901 B CN101939901 B CN 101939901B CN 2008801267065 A CN2008801267065 A CN 2008801267065A CN 200880126706 A CN200880126706 A CN 200880126706A CN 101939901 B CN101939901 B CN 101939901B
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-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
- H02M7/53875—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L9/00—Electric propulsion with power supply external to the vehicle
- B60L9/005—Interference suppression
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2200/00—Type of vehicles
- B60L2200/26—Rail vehicles
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
- H02M1/0022—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters the disturbance parameters being input voltage fluctuations
Abstract
The invention provides a power converting device. In a conventional power converting device, control for eliminating or suppressing a beat phenomenon is performed by a control microcomputer. Since computation time is required by the control microcomputer, control delay is generated. Because of the control delay, the effect of fully reducing the pulses of current and torque cannot be obtained. Further, a method for detecting a pulse component using a band-pass filter does not cope with a train in which the frequency of an alternating-current power is switched while the train is running, since a plurality of band-pass filters are required to be provided and switched according to the frequency of the power. A power converting device according to the present invention stores a direct-current voltage value at the predetermined times of sampling from the latest, estimates a direct-current voltage estimation value after the passage of predetermined time from the latest sampling using the stored direct-current voltage value, and controls the amplitude or the frequency of alternating-current power outputted from an inverter using the estimated direct-current voltage estimation value so that the variation of the alternating-current power outputted from the inverter caused by a pulse in the direct current side of the inverter is suppressed.
Description
Technical field
The present invention relates to power conversion device, this power conversion device can be converted to direct current the alternating current of changeable frequency, voltage variable, be particularly related to the power conversion device that comprises rectifier and inverter, above-mentioned inverter as input, is converted to the interchange of changeable frequency, voltage variable with the VD of above-mentioned rectifier.
Background technology
In for motor vehicle power conversion device of existing electric railroad, rectifier is imported by pantograph and transformer etc. the single phase alternating current power supply between overhead wire and the track as the interchange side, carries out the AC/DC conversion, makes it become predetermined direct voltage.Comprise capacitor for smooth voltage in the DC side of rectifier.The direct current that capacitor is had utilizes inverter to be converted to the AC rotary motor such as ac induction motor drive of the alternating current inverter output of changeable frequency, voltage variable.In addition, the voltage of the capacitor DC input voitage that namely is input to inverter arranges current detector by the interchange outlet side that voltage detector detects at inverter.
The voltage of capacitor is pulsed with the frequency (this frequency is called ripple frequency) of the twice of the frequency of AC power.Known if do not take any countermeasure in the frequency (being called output frequency) of the alternating current of inverter output under near the situation of ripple frequency, then the torque meeting that produces of the alternating current of inverter output and then motor changes with the difference of ripple frequency and output frequency.Such change is called pulsation phenomenon.The occurrence cause of pulsation phenomenon is as follows: namely, can be caused the power generation difference of positive half period and the negative half-cycle of alternating current by the change of direct voltage.
In order to eliminate or to suppress pulsation phenomenon and carry out following control: namely, utilize band pass filter etc., from by only extracting flutter component the detected DC input voitage that is input to inverter of voltage detector, in the one-period of ripple frequency with being in proportion of flutter component make the output frequency change of inverter.(for example with reference to patent documentation 1)
The special fair 7-468198 communique (Fig. 1, claim 1) of patent documentation 1 Japan's patent
Summary of the invention
In existing power conversion device, utilize the control microcomputer to carry out for the control of eliminating or suppress pulsation phenomenon.Therefore, owing to need operation time in the control microcomputer, therefore produce control lag.According to the operation time of control microcomputer, control lag can increase sometimes, can have phase retardation in ripple frequency, can't obtain to reduce fully the pulsation of electric current, the effect of torque pulse.Therefore, existence can't be used the problem of cheap control microcomputer.
For example, be under the situation of 500 μ seconds in the operation time of control microcomputer, if the frequency of AC power is 50Hz, the phase retardation P[degree of ripple frequency then] as follows.
P=500[μ second] * 2 * 50[Hz] * the 360[degree]=the 18.0[degree]
Frequency in AC power is under the situation of 60Hz, and is as follows.
P=500[μ second] * 2 * 60[Hz] * the 360[degree]=the 21.6[degree]
As can be known, for the phase retardation P of identical control lag according to the frequency of AC power and difference.As can be known, this phase retardation increases along with the increase of the operation time of control microcomputer.Thereby, Lian Jia control microcomputer, because its operation time is more long, so phase retardation more increases, and can reduce the pulsation of electric current, the effect of torque pulse more reduces.
In addition, to switch the electric car of the frequency (for example between 50Hz and 60Hz) of AC power when travelling, utilize band pass filter to detect in the method for flutter component, owing to comprise a plurality of band pass filters, need switch according to supply frequency, therefore have the problem that is difficult for reply.
The present invention finishes in order to solve existing problem as described above, its purpose is to provide a kind of power conversion device, the ripple frequency of this power conversion device and direct voltage is irrelevant, can compensate the delay that is present in testing agency, the control system, the output that can suppress power conversion device is the change that alternating current takes place.
Power conversion device involved in the present invention is characterised in that, comprising: rectifier, and this rectifier is converted to direct current with alternating current; Capacitor, this capacitor is connected with the DC side parallel of above-mentioned rectifier; The dc voltage measurement device, this dc voltage measurement device is measured the voltage of above-mentioned capacitor; Inverter, this inverter and above-mentioned capacitor are connected in parallel, and direct current are converted to the alternating current of optional frequency; And controller, this controller with dc voltage value that above-mentioned dc voltage measurement device is measured of predetermined sampling period as input, control above-mentioned inverter, above-mentioned controller comprises: voltage control division, and this voltage control division is controlled the voltage amplitude of the alternating current of above-mentioned inverter output; FREQUENCY CONTROL portion, this FREQUENCY CONTROL portion controls the frequency of the alternating current of above-mentioned inverter output; The dc voltage value storage part, the above-mentioned dc voltage value of the sampling of the predetermined quantity that this dc voltage value storage part will be counted from last samples is stored; Dc voltage value is inferred portion, and this dc voltage value portion of inferring uses the above-mentioned dc voltage value that is stored in the above-mentioned dc voltage value storage part to come the direct voltage presumed value after the scheduled time of counting from up-to-date sampling instant is inferred; And pulsation suppressing portion, the above-mentioned direct voltage presumed value that this pulsation suppressing portion is inferred the above-mentioned dc voltage value portion of inferring is as input, act on any one party of above-mentioned voltage control division and said frequencies control part or the two, make and suppress the change that the pulsation alternating current that cause, above-mentioned inverter output by the DC side of above-mentioned inverter takes place.
Power conversion device involved in the present invention owing to it is characterized in that, comprising: rectifier, and this rectifier is converted to direct current with alternating current; Capacitor, this capacitor is connected with the DC side parallel of above-mentioned rectifier; The dc voltage measurement device, this dc voltage measurement device is measured the voltage of above-mentioned capacitor; Inverter, this inverter and above-mentioned capacitor are connected in parallel, and direct current are converted to the alternating current of optional frequency; And controller, this controller with dc voltage value that above-mentioned dc voltage measurement device is measured of predetermined sampling period as input, control above-mentioned inverter, above-mentioned controller comprises: voltage control division, and this voltage control division is controlled the voltage amplitude of the alternating current of above-mentioned inverter output; FREQUENCY CONTROL portion, this FREQUENCY CONTROL portion controls the frequency of the alternating current of above-mentioned inverter output; The dc voltage value storage part, the above-mentioned dc voltage value of the sampling of the predetermined quantity that this dc voltage value storage part will be counted from last samples is stored; Dc voltage value is inferred portion, and this dc voltage value portion of inferring uses the above-mentioned dc voltage value that is stored in the above-mentioned dc voltage value storage part to come the direct voltage presumed value after the scheduled time of counting from up-to-date sampling instant is inferred; And pulsation suppressing portion, the above-mentioned direct voltage presumed value that this pulsation suppressing portion is inferred the above-mentioned dc voltage value portion of inferring is as input, act on any one party of above-mentioned voltage control division and said frequencies control part or the two, make to suppress that pulsation by the DC side of above-mentioned inverter causes, the change that the alternating current of above-mentioned inverter output takes place, therefore, power conversion device of the present invention has following effect: namely, irrelevant with the ripple frequency of direct voltage, can compensate and be present in testing agency, delay in the control system, the output that can suppress power conversion device are the change that alternating current takes place.
Description of drawings
Fig. 1 is the block diagram of structure example of the power conversion device of expression embodiments of the present invention 1.
Fig. 2 is the figure of structure of rectifier of the power conversion device of explanation embodiments of the present invention 1.
Fig. 3 is the figure of the voltage concept of inferring of explanation embodiments of the present invention 1.
Fig. 4 is the figure of the voltage presumed value of the Next sampling instant of inferring in the dc voltage value portion of inferring under the situation that is illustrated in the power conversion device of embodiments of the present invention 1, will be set at for 250 μ seconds the sampling time.
Fig. 5 be explanation in the power conversion device of embodiments of the present invention 1, suppressing the situation of pulsation phenomenon and do not suppressing the figure of the cogging of the AC rotary motor under the situation of pulsation phenomenon.Fig. 5 (A) is the situation that control of the present invention is carried out in expression, and Fig. 5 (B) is the situation of representing not carry out control of the present invention.
Fig. 6 is the block diagram of structure example of the power conversion device of expression embodiments of the present invention 2.
Fig. 7 is the block diagram of structure example of the power conversion device of expression embodiments of the present invention 3.
Fig. 8 is the block diagram of structure example of the power conversion device of expression embodiments of the present invention 4.
Fig. 9 is the block diagram of structure example of the power conversion device of expression embodiments of the present invention 5.
Figure 10 is the block diagram of structure example of the power conversion device of expression embodiments of the present invention 6.
Figure 11 is the figure of the voltage concept of inferring of explanation embodiments of the present invention 6.
Label declaration
1 rectifier
2 capacitors
3 inverters
4 AC rotary motor (induction machine)
4A AC rotary motor (synchronous machine)
5 controllers
51 current/voltage value storage parts
52 current/voltage values are inferred portion
53 pulsation extraction units
54 angular frequency controlled quentity controlled variable operational parts (pulsation suppressing portion)
55 FREQUENCY CONTROL portions
55A FREQUENCY CONTROL portion
56 voltage control divisions
The 56A voltage control division
The 56B voltage control division
The 56C voltage control division
57 pulse generation portions
57A pulse generation portion
58 modulation ratio operational parts (pulsation suppressing portion)
59 phase voltage converter sections (pulsation suppressing portion)
5A converter section (pulsation suppressing portion) reciprocal
5B angular frequency command value configuration part
5C output voltage operational part
6 voltage detectors (dc voltage measurement device)
7 rotation sensors
8 filter section
Embodiment
Fig. 1 is the block diagram of structure example of the power conversion device of expression embodiments of the present invention 1.Power conversion device among Fig. 1 comprises: rectifier 1, and 1 pair of alternating current from AC power of this rectifier carries out rectification and is converted into direct current; Capacitor 2, this capacitor 2 is connected with the DC side parallel of rectifier 1, and smoothing is carried out in the pulsation that is caused by rectification; And inverter 3, this inverter 3 will be stored in the alternating current that direct current in the capacitor 2 is converted to optional frequency, free voltage.Being connected with AC rotary motor 4 in the interchange side of inverter 3 is induction machine.Controller 5 control inverters 3, make output based on obtain for the command value of the torque of AC rotary motor 4 outputs and anglec of rotation frequency, inverter 3 voltage amplitude and the frequency that should export.In addition, for by becoming the AC rotary motor 4 that power conversion device of the present invention drives, no matter be induction machine or synchronous machine, can both expect identical effect.
Fig. 2 represents to illustrate the figure of the structure of rectifier 1.Fig. 2 is single-phase diode rectification circuit.Rectifier also can be the bridge circuit that is made of switch elements such as IGBT.Can be not yet with single-phase and with three-phase alternating current as power supply.For rectifier, so long as can be converted to direct current from the alternating current that exchanges power supply, then can use any type of rectifier.
Controller 5 is to control every the discrete time, and the voltage of the capacitor 2 that will measure as the voltage detector 6 of dc voltage measurement device with the predetermined sampling period is that the anglec of rotation frequency measured of dc voltage measurement value and rotation sensor 7 is as input.The controlled quentity controlled variable that will determine based on up-to-date sampled value is used for next sampling instant.
Controller 5 comprises: dc voltage value storage part 51 stores the voltage measuring value of the predetermined number of counting from up-to-date voltage measuring value (being three herein) in this dc voltage value storage part 51; Dc voltage value is inferred portion 52, this current/voltage value is inferred the voltage measuring value that portion 52 uses the predetermined number of counting from up-to-date voltage measuring value (being three herein), infers the voltage of counting from up-to-date sampling instant that has passed through the capacitor 2 after the scheduled time (being a sampling period) herein based on multinomial approximate expression; Pulsation extraction unit 53, this pulsation extraction unit 53 input direct voltage value is successively inferred the direct voltage presumed value that portion 52 infers, and extracts flutter component Vbeat; FREQUENCY CONTROL amount operational part 54, this FREQUENCY CONTROL amount operational part 54 are that the flutter component Vbeat that is extracted by pulsation extraction unit 53 is multiplied by the pulsation suppressing portion that predetermined gain is come output angle FREQUENCY CONTROL amount ω beat; FREQUENCY CONTROL portion 55, this FREQUENCY CONTROL portion 55 with angular frequency controlled quentity controlled variable ω beat as input, the frequency of the output voltage of control inverter 1; Voltage control division 56, the amplitude of the output voltage of these voltage control division 56 control inverters 1; And pulse generation portion 57, this pulse generation portion 57 will be from the signal of frequency control part 55 and voltage control division 56 as input, the grid impulse that the switch element that output has inverter 1 is controlled.
Next explanation action.Dc voltage value is inferred portion 52 and is extrapolated with the second approximation multinomial of obtaining based on the dc voltage measurement value of three sampling instants counting from up-to-date sampling instant, infers the dc voltage value of next sampling instant.
In order to derive the formula that the dc voltage value of next sampling instant is inferred, the variable that definition is following.
The T sampling period
t
nUp-to-date sampling instant
t
N-mSampling instant before count from up-to-date sampling instant m time (=Tn * T).
t
N+1Next sampling instant from up-to-date sampling instant
V
nThe voltage measuring value of up-to-date sampling instant
V
N-mThe voltage measuring value of the sampling instant before count from up-to-date sampling instant m time
E
N+1Voltage presumed value from the next sampling instant of up-to-date sampling instant
Fig. 3 shows the figure of the voltage concept of inferring of explanation embodiments of the present invention 1.Based on three voltage measuring value V counting from up-to-date voltage measuring value
n, V
N-1, V
N-2, obtain the multinomial that shows as the function of time with the voltage shown in the solid-line curve.Import time of next sampling instant to the multinomial of obtaining, calculate the voltage presumed value E of next sampling instant
N+1
Herein, with t
nBe considered as time reference, such second approximation multinomial of supposing dc voltage value as follows.
V
n-m＝a×(m×T)
2-b×(m×T)+c (1)
If the voltage measuring value substitution formula (1) of three sampling instants will counting from up-to-date sampling instant is then as follows.
V
n＝c (2)
V
n-1＝a×T
2-b×T+c (3)
V
n-2＝4×a×T
2-2×b×T+c (4)
In addition, if calculate the voltage presumed value E of next sampling instant based on formula (1)
N+1, then as follows.
E
n+1＝a×T
2+b×T+c (5)
If it is deduct formula (3) with formula (5), then as follows.
E
n+1-V
n-1＝2×b×T (6)
If it is with formula (5) and formula (3) addition, then as follows.
E
n+1+V
n-1＝2×a×T
2+2×c (7)
Formula (7) be multiply by twice, afterwards, therefrom deduct formula and formula (6) sum after formula (2) multiply by three times, the right of resulting formula is identical with the right of formula (4), so following formula is set up.
V
n-2＝2×(E
n+1+V
n-1)-(E
n+1-V
n-1)
-3×V
n (8)
If to E
N+1Find the solution formula (8), then as follows.
E
n+1＝3×(V
n-V
n-1)+V
n-2 (9)
Formula (9) is to extrapolate, obtain the formula of the voltage presumed value of next sampling instant with the second approximation multinomial of obtaining based on the dc voltage measurement value of three sampling instants counting from up-to-date sampling instant.Owing to do not need to obtain the polynomial coefficient a of second approximation, b, c, as long as the voltage measuring value based on three sampling instants counting from up-to-date sampling instant just can be obtained the voltage presumed value of next sampling instant by simple calculating, even therefore also can calculate with enough responses with the so not high control microcomputer of operational capability.
Fig. 4 show with sampling time T be made as under the situations of 250 μ seconds, dc voltage value infers the voltage presumed value of the next sampling instant that portion 52 infers.The voltage presumed value of next sampling instant is the solid line that is step-like variation every a T.In addition, show also simultaneously that voltage measuring value with up-to-date sampling instant has postponed a sampling instant T and the curve drawn.Represent the dc voltage value that obtains based on the different second approximation multinomial in each interval with solid-line curve.As can be known, the voltage presumed value of next sampling instant roughly can correctly be inferred direct voltage.In addition, because the computing be scheduled in a sampling period, each sampling period is controlled, therefore, not to the inferring under the situation of reading in advance and controlling of next sampling instant, control will postpone a sampling period.
In addition, also can be similar to the multinomial more than three times.Although omitted the details of deriving, under the situation of the dc voltage value of extrapolating, inferring next sampling instant with three approximation polynomials obtaining based on the voltage measuring value of four sampling instants counting from up-to-date sampling instant, carry out according to following formula.
E
n+1＝4×(V
n-V
n-2)-6×V
n-1-V
n-3 (10)
Equally, under the situation of using four approximation polynomials, as follows.
E
n+1＝5×(V
n-V
n-3)-10×(V
n-1-V
n-2)
+V
n-4 (11)
According to the inferring of the direct voltage of multinomial approximate expression from formula (9) to formula (11), in order to obtain the coefficient of multinomial approximate expression, used the measured value of the direct voltage of required MIN quantity.Owing to comprise noise etc. in the measured value of direct voltage, thereby in order in voltage is inferred, not to be subjected to the influence of noise etc. as far as possible, also can increase the quantity of the measured value of direct voltage, obtain the multinomial approximate expression that square error becomes minimum, and use it for and infer.In addition, also can use the prearranged multiple (for example twice) with the sampling period to be the multinomial approximate expression that unit obtains, infer the direct voltage of next sampling instant.For example, be under the unit situation of inferring in the twice of utilizing quadratic expression with the sampling period, as follows.
E
n+1＝(15/8)×V
n-(5/4)×V
n-2
+(3/8)×V
n-4 (12)
In addition, also can infer the direct voltage of next sampling instant etc. based on the measured value of the direct voltage of up-to-date, sampling instants before once, before three times.Also can use the approximate expression outside the multinomial to infer.Also can infer the dc voltage value of future 2 times or 1.5 times sampling instant in future.Infer portion for dc voltage value, as long as can store the dc voltage measurement value of the sampling instant of the predetermined number of counting from up-to-date sampling instant in advance, use all or part of the dc voltage measurement value of storing, having come passing through of counting from up-to-date sampling instant the dc voltage value after the scheduled time to infer, then can be that any type of dc voltage value is inferred portion.
Dc voltage value is inferred the voltage presumed value E of the next sampling instant that portion 52 infers
N+1Input voltage pulsation detection portion 53 extracts flutter component Vbeat.Mains ripple test section 53 comprises the time lag of first order filter with predetermined time constant (being made as T1), deducts the output of time lag of first order filter from the voltage presumed value, extracts as flutter component.That is, become following formula.In the formula, s represents differential operator.
Vbeat＝E
n+1-E
n+1/(1+T1×s)
＝((T1×s)/(1+T1×s))×E
n+1 (13)
Time lag of first order filter time constant T1 is made as more than 10 times of sampling period T, the preferably value more than 100 times at least.Under the T=250 μ situation of second, as long as T1=0.0025 is above second, preferably T1=0.025 is more than second.
In angular frequency controlled quentity controlled variable operational part 54, according to the predetermined gain that determines rightly (=K), utilize following formula to calculate angular frequency controlled quentity controlled variable ω beat, make the frequency of the AC power that inverter 3 is exported under the bigger situation of flutter component Vbeat reduce, the frequency of the AC power that inverter 3 is exported under the less situation of flutter component Vbeat increases.
ωbeat＝K×Vbeat (14)
Under the situation of vector controlled induction motor, the voltage and current in can such dq coordinate system that determines to rotate with rotating magnetic flux as follows.The d axle is the consistent axle of the direction with the secondary magnetic flux, and the q axle is the axle with d axle quadrature.Vector control only illustrates summary with existing identical.
Define the variable that following variable is used as showing voltage, electric current etc.
ω s
*: the slip angular frequency command value
The anglec of rotation frequency of ω AC rotary motor 4 is measured by rotation sensor 7
The frequency of the alternating voltage of ω inv inverter 3 outputs
The phase place of the d axle of θ fixed coordinate system
Vd
*The d shaft voltage command value that inverter 3 will be exported
Vq
*The q shaft voltage command value that inverter 3 will be exported
Id
*D shaft current command value and secondary magnetic flux command value that inverter 3 will be exported are proportional
Iq
*Q shaft current command value and torque instruction value that inverter 3 will be exported are proportional
In addition, the following equipment constant as induction machine of definition.
A resistance value of Rs induction machine
The secondary resistance value of Rr induction machine
An inductance value of Ls induction machine
The secondary inductance value of Lr induction machine
The mutual inductance of M induction machine
Leakage inductance factor sigma=1-(M of σ induction machine
2/ (Ls * Lr))
In vector control, the slip angular frequency command value ω s of induction machine
*As follows.
ωs
*＝(Iq
*×Rr)/(Id
*×Lr) (15)
The angular frequency inv of the alternating voltage of inverter 3 outputs is as follows.In addition, suppress under the situation of pulsation phenomenon not considering, no ω beat this.
ωinv＝ω+ωs
*+ωbeat (16)
Formula (14) and formula (16) expression: under the bigger situation of the voltage Vbeat of flutter component, the angular frequency inv of the alternating voltage of inverter 3 outputs increases, and under the less situation of Vbeat, ω inv reduces.If carry out above-mentioned control, then the difference power of the positive half period of alternating current and negative half-cycle reduces, and can suppress pulsation phenomenon.
Diagonal frequencies ω inv carries out integration, utilizes following formula to calculate the phase theta of d axle.
θ＝∫ωinv dt (17)
The voltage of d axle and q axle is as follows.
Vd
*＝Rs×Id
*-σ×ωinv×Ls×Iq
* (18)
Vq
*＝Rs×Iq
*+ωinv×Ls×Id
* (19)
To the 55 input angle FREQUENCY CONTROL amount ω beat of FREQUENCY CONTROL portion, calculating formula (15) is to formula (17).Voltage control division 56 calculating formulas (18) and formula (19).Pulse generation portion 57 is with the phase theta of d axle and the voltage instruction value Vd of d axle and q axle
*And Vq
*As input, produce the grid impulse of the grid that is applied to switch element, make that the alternating voltage of inverter 3 outputs is consistent with above-mentioned command value.
Can confirm to carry out effect under the situation of control of above-mentioned inhibition pulsation phenomenon with emulation.Fig. 5 be explanation in the power conversion device of present embodiment 1, suppress pulsation phenomenon control situation and do not suppress the figure of the cogging of the AC rotary motor under the situation of control of pulsation phenomenon.Fig. 5 (A) is the situation of carrying out control of the present invention, and Fig. 5 (B) is the situation of not carrying out control of the present invention.According to Fig. 5 as can be known, utilize the present invention can suppress pulsation phenomenon.
The condition of emulation is that the capacity of Electric induction machine is that 200kW, breakdown torque are that 2000Nm, dc voltage average value be 1500V, flutter component as the amplitude of 2% flutter component are that the frequency of 30V, AC power is that the frequency of 60Hz, flutter component is 120Hz.
As mentioned above, owing to infer the dc voltage value of next sampling instant, and control based on the dc voltage value that this is inferred, therefore can obtain following effect: namely, do not produce the caused delay of detection, calculation process by flutter component, can suppress the control of pulsation phenomenon.In addition, owing to do not use band pass filter, even therefore can obtain the effect that under the situation that supply frequency changes, yet can easily tackle
The pulsation suppressing portion is to act on FREQUENCY CONTROL portion to suppress pulsation phenomenon, but also can act on voltage control division.Although structure can complicate, also can be the pulsation suppressing portion act on FREQUENCY CONTROL portion and voltage control division the two.
Above-mentioned situation also is suitable in other embodiments.
In the voltage of the capacitor 2 that voltage detector 6 is measured, may include the situation of the switch noise that in the switch element that rectifier 1, inverter 3 have, produces.It is also conceivable that the situation that includes the noise except switch noise.In present embodiment 2, the voltage of having removed after the high fdrequency component that can be judged as noise is preserved as the dc voltage measurement value.Fig. 6 shows the figure of the structure of the power conversion device that present embodiment 2 is described.
The difference of explanation and Fig. 1 of execution mode 1 only.The output of voltage detector 6 is imported into controller 5 by filter 8.Filter 8 is that time constant is the time lag of first order filter of T2.The inverse that makes time constant T2 is that the such degree of the switching frequency (being 1000Hz herein) of frequency ratio inverter 3 is little, and is more much bigger than the frequency of flutter component, makes the flutter component of direct voltage also be imported into controller 5.Also can use high frequency to remove filter to replace time lag of first order filter.So long as can remove the high a lot of signal of frequency than the flutter component of direct voltage, then can use any type of filter.
In present embodiment 2, also carry out identical action with execution mode 1.Owing to infer the dc voltage value of next sampling instant, and control based on the dc voltage value that this is inferred, therefore can obtain following effect: namely, do not produce the caused delay of detection, calculation process by flutter component, can suppress the control of pulsation phenomenon.In addition, owing to do not use band pass filter, even therefore can obtain the effect that under the situation that supply frequency changes, yet can easily tackle.Have again, owing to infer based on the measured value of having removed by the direct voltage behind the noise of generations such as switch, therefore also can improve the precision of inferring of direct voltage.
Above-mentioned situation also is suitable in other embodiments.
The difference of explanation and Fig. 1 of execution mode 1 only.Not having pulsation extraction unit 53 and angular frequency controlled quentity controlled variable operational part 54, is modulation ratio calculating part 58 and appended the pulsation suppressing portion.Modulation ratio calculating part 58 calculates modulation ratios, makes this modulation ratio infer the voltage presumed value E of the next sampling instant that portion 52 infers out with utilizing dc voltage value
N+1Be inversely proportional to.Import the modulation ratio that is calculated by modulation ratio operational part 58 to voltage control division 56A.
Next explanation action.Dc voltage value is inferred portion 52 according to formula (9), infers the voltage presumed value E of next sampling instant
N+1Utilize formula (15) to obtain the slip angular frequency ω s* of induction machine.The angular frequency inv of the alternating voltage of inverter 3 outputs is as follows.
ωinv＝ω+ωs
* (20)
The phase theta of d axle is calculated and is got by formula (17).The voltage of d axle and q axle is calculated and is got by formula (18) and formula (19).
In modulation ratio operational part 58, utilize following formula to calculate modulation ratio PMF.
Calculate modulation ratio PMF, then direct voltage presumed value E if utilize formula (21)
N+1Modulation ratio PMF is less when big, direct voltage presumed value E
N+1Hour modulation ratio PMF is bigger.Even the change of direct voltage presumed value, the alternating current not change in theory fully that produces in the inverter, even change, the size of change also can reduce.Therefore, can suppress pulsation phenomenon.
With modulation ratio PMF and voltage instruction value vector (Vd
*, Vq
*) multiply each other, obtain following three-phase voltage command value (Vu
*, Vv
*, Vw
*).
Vu
*＝PMF×cos(θv) (22)
Vv
*＝PMF×cos(θv-(2/3)π) (23)
Vw
*＝PMF×cos(θv+(2/3)π) (24)
In the formula, θ v is the phase place of voltage instruction vector, omits in advance than the phase place of d axle, can calculate by enough following formulas.
θv＝θ+arctan(Vq
*/Vd
*) (25)
The grid impulse that pulse generation portion 57 produces the grid that is applied to switch element makes the three-phase alternating voltage of inverter 3 outputs and formula (22) arrive the three-phase voltage command value (Vu of formula (24) expression
*, Vv
*, Vw
*) unanimity.
Even act under the situation of voltage control division in the pulsation suppressing portion, owing to infer the dc voltage value of next sampling instant, and control based on the dc voltage value that this is inferred, therefore also can obtain following effect: namely, do not produce the caused delay of detection, calculation process by flutter component, can suppress the control of pulsation phenomenon.In addition, owing to do not use band pass filter, even therefore can obtain the effect that under the situation that supply frequency changes, yet can easily tackle.And, owing to do not need the extraction unit of pulsing, so the structure of controller is further simplified.
Controller 5 comprises: above-mentioned dc voltage value storage part 51 and dc voltage value are inferred portion 52; Phase voltage converter section 59, this phase voltage converter section 59 is inferred the direct voltage presumed value that portion 52 infers with dc voltage value and is converted to phase voltage; Converter section 5A reciprocal, this inverse converter section 5A obtain the inverse by the phase voltage of phase voltage converter section 59 outputs; Angular frequency command value configuration part 5B, this angular frequency command value configuration part 5B setpoint frequency command value; Output voltage operational part 5C, this output voltage operational part 5C decides output voltage based on frequency instruction value; Voltage control division 56B, the voltage of the output voltage operational part of this voltage control division 56B 5C output is multiplied by the output of converter section 5A reciprocal, and with it as voltage amplitude; And the 57A of pulse generation portion, the 57A of this pulse generation portion with the output of voltage control division 56B and angular frequency command value configuration part 5B as input, and the grid impulse of the switch element that has of output control inverter 3.In addition, the pulsation suppressing portion comprises phase voltage converter section 59 and converter section 5A reciprocal.
The following describes action.Dc voltage value storage part 51 and dc voltage value are inferred portion 52 and are carried out the action identical with execution mode 1.In phase voltage converter section 59, utilize following formula with the voltage presumed value E of next sampling instant
N+1Be converted to phase voltage V1.
V1＝(2/π)×E
n+1 (26)
In converter section 5A reciprocal, the inverse of computing V1 as described below is V2.This formula is identical with the formula (21) of execution mode 3, can suppress the change of the alternating current of inverter generation, can suppress pulsation phenomenon.
V2＝1/V1 (27)
In angular frequency command value configuration part 5B, will be converted to angular frequency, set angle frequency instruction value ω * by the frequency instruction value of outside input.To output voltage operational part 5C input angle frequency instruction ω *, computing voltage instruction value V* makes the ratio of voltage and frequency become constant.
In voltage control division 56B, V* and V2 are multiplied each other, and export its result.In the 57A of pulse generation portion, control the grid impulse of the grid of the switch element that is applied to inverter 3, make inverter 3 export following three-phase voltage command value (Vu
*, Vv
*, Vw
*).
Vu
*＝(V
*/V1)×cos(θ) (28)
Vv
*＝(V
*/V1)×cos(θ-(2/3)π) (29)
Vw
*＝(V
*/V1)×cos(θ+(2/3)π) (30)
Even under the situation of carrying out the constant control of voltage frequency ratio, owing to infer the dc voltage value of next sampling instant, and control based on the dc voltage value that this is inferred, therefore also can obtain following effect: namely, do not produce the caused delay of detection, calculation process by flutter component, can suppress the control of pulsation phenomenon.In addition, owing to do not use band pass filter, even therefore can obtain the effect that under the situation that supply frequency changes, yet can easily tackle.And, owing to do not need the extraction unit of pulsing, so the structure of controller is further simplified.
Execution mode 5.
Present embodiment 5 is that execution mode 3 is changed, and makes applicable to permagnetic synchronous motor.Fig. 9 shows the figure of the structure of the power conversion device that present embodiment 5 is described.
The difference of explanation and Fig. 7 of execution mode 3 only.AC rotary motor 4A is permagnetic synchronous motor.The 55A of FREQUENCY CONTROL portion and voltage control division 56C are carried out control corresponding to synchronous machine.The relation of the 55A of FREQUENCY CONTROL portion and voltage control division 56C and other inscapes is identical with the situation of execution mode 3.
The following describes action.Dc voltage value storage part 51 and dc voltage value are inferred portion 52 and are carried out the action identical with execution mode 1.For the action of account for voltage control part 56C, carry out giving a definition as the equipment constant of synchronous machine.
The resistance value of R synchronous machine
The d axle inductance value of Ld synchronous machine
The q axle inductance value of Lq synchronous machine
Because the angular frequency inv of the alternating voltage of inverter 3 outputs is consistent with the anglec of rotation frequency of synchronous machine, thereby as follows.The phase theta of d axle is calculated and is got by formula (17).
ωinv＝ω (31)
The voltage of d axle and q axle is as follows.In the formula, p is differential operator.Also can omit p this.
Vd
*＝(R+Ld×p)×Id
*-ω×Lq×Iq
* (32)
Vq
*＝(R+Lq×p)×Iq
*+ω×Ld×Id
* (33)
Vd based on formula (32)
*And the Vq of formula (33)
*, modulation ratio operational part 58 utilizes above-mentioned formula (21) to calculate modulation ratio PMF.With modulation ratio PMF and voltage instruction value vector (Vd
*, Vq
*) multiply each other, obtain the three-phase voltage command value (Vu that utilizes formula (22) to get to formula (24) calculating
*, Vv
*, Vw
*).
Even under the situation that drives synchronous machine, owing to infer the dc voltage value of next sampling instant, and control based on the dc voltage value that this is inferred, therefore also can obtain following effect: namely, do not produce the caused delay of detection, calculation process by flutter component, can suppress the control of pulsation phenomenon.In addition, owing to do not use band pass filter, even therefore can obtain the effect that under the situation that supply frequency changes, yet can easily tackle.And, owing to do not need the extraction unit of pulsing, so the structure of controller is further simplified.
The following describes action.Append the following variable of definition herein.
E
N+kThe voltage presumed value in the moment of the k week after date of counting from up-to-date sampling instant
Figure 11 shows the figure of the voltage concept of inferring of explanation embodiments of the present invention 6.Based on three voltage measuring value V counting from up-to-date voltage measuring value
n, V
N-1, V
N-2, obtain the multinomial that shows as the function of time with the voltage shown in the solid-line curve.The time in the moment of the k week after date that input is counted from up-to-date sampling instant in the multinomial of obtaining, thus the voltage presumed value E in the moment of the k week after date of counting from up-to-date sampling instant calculated
N+k
As above-mentioned formula (1), suppose the second approximation multinomial of dc voltage value.For the voltage measuring value of three sampling instants counting from up-to-date sampling instant, formula (2) is set up to formula (4).If based on formula (1) calculating voltage presumed value E
N+k, then as follows.
E
n+k＝a×(k×T)
2+b×k×T+c (34)
Come cancellation a, b, c based on formula (2) to formula (4) and formula (34), then as follows.
E
n+k＝((k
2+3×k+2)/2)×V
n-(k
2+2×k)×V
n-1
+((k
2+k)/2)×V
n-2 (35)
If it is establish k=1.5, then as follows according to formula (35).
E
n+1.5＝(35/8)×V
n-(21/4)×V
n-1
+(15/8)×V
n-2 (36)
Dc voltage value is inferred the voltage presumed value E of the k week after date that the sampling instant from up-to-date that portion 52 infers counts
N+kBe input to mains ripple test section 53, extract flutter component Vbeat equally with execution mode 1.The extraction formula is with the E in the formula (13)
N+1Be replaced into E
N+kAction afterwards is identical with the situation of execution mode 1.
As mentioned above, owing to inferred from having passed through of counting of up-to-date sampling instant the dc voltage value in the moment after the scheduled time (being the k cycle herein), and control based on the dc voltage value that this is inferred, therefore can obtain following effect: namely, do not produce the caused delay of detection, calculation process by flutter component, also further the control lag in the inverter is revised, can be suppressed the control of pulsation phenomenon.In addition, owing to do not use band pass filter, even therefore can obtain the effect that under the situation that supply frequency changes, yet can easily tackle.
The scheduled time can not be k=1.5 also, also can actually attempt deciding suitable k value, makes to obtain better control result.In addition, also can extrapolate to the approximate expression more than three times.Although omitted the details of deriving, but extrapolate with three approximation polynomials obtaining based on the voltage measuring value of four sampling instants counting from up-to-date sampling instant, infer count from up-to-date sampling instant k week after date the situation of dc voltage value in the moment under, become following formula.
E
n+k＝((k
3+6×k
2-5×k+6)/6)×V
n
-((k
3+5×k
2-6×k)/2)×V
n-1
+((k
3+4×k
2-3×k)/2)×V
n-2
-((k
3+3×k
2-2×k)/6)×V
n-3 (37)
Equally, under the situation of using four approximation polynomials, as follows.
E
n+k＝((k
4+10×k
3+11×k
2+26×k+24)/24)×V
n
-((k
4+9×k
3+26×k
2+12×k)/6)×V
n-1
+((k
4+8×k
3+19×k
2+12×k)/4)×V
n-2
-((k
4+7×k
3+14×k
2+8×k)/6)×V
n-3
+((k
4+6×k
3+11×k
2+6×k)/24)×V
n-4 (38)
If k=1.5 is under the situation of use formula (37), as follows.
E
n+1.5＝(27/16)×V
n-(45/16)×V
n-1
+(63/16)×V
n-2+(19/16)×V
n-3 (39)
Under the situation of use formula (38), as follows.
E
n+1.5＝(555/128)×V
n-(597/32)×V
n-1
+(1485/64)×V
n-2-(385/32)×V
n-3
+(315/128)×V
n-4 (40)
For fear of the influence of noise etc., also can to via the voltage removed the voltage of the capacitor 2 measured from voltage detector 6 behind the filter of high frequency preserve, and use it for dc voltage value and infer portion.Also can increase the quantity of the measured value of direct voltage, obtaining square error becomes minimum multinomial approximate expression, and uses it for and infer, to replace using filter.In addition, also can use the prearranged multiple (for example twice) with the sampling period to be the multinomial approximate expression that unit obtains, infer from having passed through of counting of up-to-date sampling instant the direct voltage in the moment after the scheduled time (being the k cycle herein).
In addition, in embodiments of the present invention 1 to 6, as the load that links to each other with power conversion device, show the situation of AC rotary motor, but AC rotary motor is not limited to induction machine, synchronous machine, can both expect identical effect to any type of AC rotary motor.
In addition, except AC rotary motor, apply the present invention to control linear induction motor, linear synchronized motor, and the situation of the power conversion device of electromagnetic actuators such as solenoid under, also can expect identical effect.
Structure shown in the above execution mode is an example of content of the present invention, also can with other known technical combinations, in the scope that does not break away from main points of the present invention, also can omit a part and wait to change and constitute.
Industrial practicality
The present invention utilizes rectifier that AC power is carried out rectification, the direct current after the rectification is come AC rotary motor is carried out the power conversion device of variable speed drive as power supply, is to be assumed to be specially adapted to the device that alternating current electric railway is electric car.In addition, can also be applicable in the aircondition, household appliances of Electric the equipment by inverter control motor, for example air conditioner, refrigerator, washing machine etc.
Claims (6)
1. for motor vehicle power conversion device of electric railroad is characterized in that, comprising:
Rectifier, the alternating current that this rectifier will generate between overhead wire and track is converted to direct current;
Capacitor, this capacitor is connected with the DC side parallel of described rectifier;
The dc voltage measurement device, this dc voltage measurement device is measured the voltage of described capacitor;
Inverter, this inverter comprises switch element, is connected in parallel with described capacitor, direct current is converted to the alternating current of optional frequency; And
The control microcomputer, this control microcomputer as input, is controlled described inverter with dc voltage value that described dc voltage measurement device is measured of predetermined sampling period,
Described control microcomputer comprises:
Voltage control division, this voltage control division is controlled the voltage amplitude of the alternating current of described inverter output;
FREQUENCY CONTROL portion, this FREQUENCY CONTROL portion controls the frequency of the alternating current of described inverter output;
The dc voltage value storage part, the described dc voltage value of the sampling of the predetermined quantity that this dc voltage value storage part will be counted from last samples is stored;
Dc voltage value is inferred portion, this dc voltage value portion of inferring uses the described dc voltage value of the sampling that is stored in predetermined quantity in the described dc voltage value storage part, that count from up-to-date sampling, comes the direct voltage presumed value of counting from next sampling instant through after the scheduled time is inferred; And
The pulsation suppressing portion, the described direct voltage presumed value that this pulsation suppressing portion is inferred the described dc voltage value portion of inferring is as input, the flutter component that utilization extracts from described direct voltage presumed value, act on any one party of described voltage control division and described FREQUENCY CONTROL portion or the two, the change that feasible inhibition is taken place by the pulsation of the DC side of described inverter alternating current that cause, described inverter output
The described dc voltage value portion of inferring obtains the predetermined time approximation polynomial that the described dc voltage value that is stored in the described dc voltage value storage part is similar to, and the direct voltage presumed value after utilizing this predetermined time approximation polynomial to the scheduled time of counting from up-to-date sampling instant is inferred.
2. power conversion device as claimed in claim 1 is characterized in that,
Described pulsation suppressing portion acts on described FREQUENCY CONTROL portion, make under the situation that the described direct voltage presumed value that the described dc voltage value portion of inferring infers increases, frequency to be reduced, under the situation that the described direct voltage presumed value that the described dc voltage value portion of inferring infers reduces, frequency is increased.
3. power conversion device as claimed in claim 1 is characterized in that,
Described pulsation suppressing portion acts on described voltage control division, make under the situation that the described direct voltage presumed value that the described dc voltage value portion of inferring infers increases, voltage amplitude to be reduced, under the situation that the described direct voltage presumed value that the described dc voltage value portion of inferring infers reduces, voltage amplitude is increased.
4. power conversion device as claimed in claim 1 is characterized in that,
Described dc voltage value is inferred portion based at the measured dc voltage value V of the described dc voltage measurement device of up-to-date sampling instant
n, the sampling instant before once dc voltage value V
N-1, and secondary before the dc voltage value V of sampling instant
N-2, utilize following formula to infer the direct voltage presumed value E of k after the sampling period of counting from up-to-date sampling instant
N+k,
E
n+k=((k
2+3×k+2)/2)×V
n－(k
2+2×k)×V
n-1
+((k
2+k)/2)×V
n-2。
5. power conversion device as claimed in claim 1 is characterized in that,
Described dc voltage value is inferred portion based at the measured dc voltage value V of the described dc voltage measurement device of up-to-date sampling instant
n, the sampling instant before once dc voltage value V
N-1, the sampling instant before the secondary dc voltage value V
N-2, and three times before the dc voltage value V of sampling instant
N-3, utilize following formula to infer the direct voltage presumed value E of k after the sampling period of counting from up-to-date sampling instant
N+k,
E
n+k=((k
3+6×k
2－5×k+6)/6)×V
n
－((k
3+5×k
2－6×k)/2)×V
n-1
+((k
3+4×k
2－3×k)/2)×V
n-2
－((k
3+3×k
2－2×k)/6)×V
n-3。
6. power conversion device as claimed in claim 1 is characterized in that,
Described dc voltage value is inferred portion based at the measured dc voltage value V of the described dc voltage measurement device of up-to-date sampling instant
n, the sampling instant before once dc voltage value V
N-1, the sampling instant before the secondary dc voltage value V
N-2, the sampling instant before three times dc voltage value V
N-3, and four times before the dc voltage value V of sampling instant
N-4, utilize following formula to infer the direct voltage presumed value E of k after the sampling period of counting from up-to-date sampling instant
N+k,
E
n+k=((k
4+10×k
3+11×k
2+26×k+24)/24)×V
n
－((k
4+9×k
3+26×k
2+12×k)/6)×V
n-1
+((k
4+8×k
3+19×k
2+12×k)/4)×V
n-2
－((k
4+7×k
3+14×k
2+8×k)/6)×V
n-3
+((k
4+6×k
3+11×k
2+6×k)/24)×V
n-4。
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|---|---|---|---|
| PCT/JP2008/052323 WO2009101673A1 (en) | 2008-02-13 | 2008-02-13 | Power converting device |
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| CN101939901B true CN101939901B (en) | 2013-09-04 |
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|---|---|
| US (1) | US8488344B2 (en) |
| EP (1) | EP2244369A4 (en) |
| JP (1) | JP4466784B2 (en) |
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- 2008-02-13 EP EP08711181.1A patent/EP2244369A4/en not_active Withdrawn
- 2008-02-13 MX MX2010008059A patent/MX2010008059A/en active IP Right Grant
- 2008-02-13 WO PCT/JP2008/052323 patent/WO2009101673A1/en active Application Filing
- 2008-02-13 CA CA2714211A patent/CA2714211C/en not_active Expired - Fee Related
- 2008-02-13 KR KR1020107014341A patent/KR101131284B1/en not_active IP Right Cessation
- 2008-02-13 JP JP2008557543A patent/JP4466784B2/en not_active Expired - Fee Related
- 2008-02-13 CN CN2008801267065A patent/CN101939901B/en not_active Expired - Fee Related
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- 2008-02-13 AU AU2008350481A patent/AU2008350481B2/en not_active Ceased
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| JP2007228659A (en) * | 2006-02-21 | 2007-09-06 | Shindengen Electric Mfg Co Ltd | Dc-dc converter |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2244369A4 (en) | 2013-10-30 |
| KR20100083198A (en) | 2010-07-21 |
| AU2008350481B2 (en) | 2012-09-13 |
| EP2244369A1 (en) | 2010-10-27 |
| CA2714211A1 (en) | 2009-08-20 |
| JP4466784B2 (en) | 2010-05-26 |
| CN101939901A (en) | 2011-01-05 |
| JPWO2009101673A1 (en) | 2011-06-02 |
| AU2008350481A8 (en) | 2010-07-29 |
| US20100308649A1 (en) | 2010-12-09 |
| WO2009101673A1 (en) | 2009-08-20 |
| MX2010008059A (en) | 2010-08-18 |
| AU2008350481A1 (en) | 2009-08-20 |
| KR101131284B1 (en) | 2012-03-30 |
| US8488344B2 (en) | 2013-07-16 |
| CA2714211C (en) | 2015-06-30 |
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